12H array and single controller.
"It depends"
Do the math
best normal case
250 I/Os per second
each I/O 8192 bytes(typical OLTP)
250 *8192 =2 mb/s (About)
No big deal
worst case
250 I/Os per second
each I/O 64k bytes(largest single I/O from MPE)
250*64kb= 16 mb/s (About)
Too much for single controller
FW controller can do 20 MB/sec but probably limited to about
8-12 MB /sec in real world
Look at performance data from your system to determine what
characteristics
your applications environment has.
Of course your actual mileage will vary...
Carl McNamee wrote:
>
> I've been doing research on this recently and the figures I most commonly
> have heard from HP and EMC are around 50 GB for performance. More if youre
> application is not i/o intensive.
>
> Carl McNamee
> Systems Administrator
> Billing Concepts
>
> -----Original Message-----
> From: Costantino, Rocky [mailto:[log in to unmask]]
> Sent: Monday, May 15, 2000 10:00 AM
> To: [log in to unmask]
> Subject: Re: 12H Array
>
> Kevin,
>
> I tend to agree, however, the AutoRAID does not work like JBOD, so it really
> isn't 12 "drives" on one channel. The AutoRAID suppports up to 8 LUNs,
> therefore, 8 LDEVs, per AutoRAID. So the channel would "see" 8 devices. The
> AutoRAID also has a cache, albeit small, and the technology to keep the most
> frequently accessed data in a RAID 0/1 space.
>
> A question that I have for the group/HP is "what is the maximum amount of
> storage (GB) that is recommended on one fast-wide interface?". The "8-10
> drives per FWD channel" has been a rule of thumb, but with 18GB drives and
> the AutoRAID, you can be looking at 140-180GB per channel!!!
>
> Regards,
>
> > _________________________________________
> >
> > Rocky J. Costantino
> > Vice President
> >
> > Computer Design & Integration, LLC
> > 696 Route 46 West
> > Teterboro, NJ 07608
> >
> > * e-mail [log in to unmask]
> > * Web http://www.cdillc.com
> > * Phone (201) 931-1420 x224
> > * Fax (201) 931-0101
> >
> >
>
> -----Original Message-----
> From: Kevin Newman [mailto:[log in to unmask]]
> Sent: Monday, May 15, 2000 10:47 AM
> To: Costantino, Rocky
> Cc: [log in to unmask]
> Subject: Re: 12H Array
>
> I would wonder about that, how can 12 SCSI drives not saturate a FW SCSI
> interface?
>
> Kevin
>
> "Costantino, Rocky" wrote:
>
> > This means all I/O through
> > one (fast-wide)channel. Not knowing the nature of your app, this may or
> may
> > not, be reason for concern. I have been told by certain HP folks that the
> > disks will be the bottleneck before the channel becomes an issue, even on
> a
> > fully loaded AutoRAID...
> >
> > Regards,
> >
> > > _________________________________________
> > >
> > > Rocky J. Costantino
> > > Vice President
> > >
> > > Computer Design & Integration, LLC
> > > 696 Route 46 West
> > > Teterboro, NJ 07608
> > >
> > > * e-mail [log in to unmask]
> > > * Web http://www.cdillc.com
> > > * Phone (201) 931-1420 x224
> > > * Fax (201) 931-0101
> > >
> > >
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